Hi,
can I assume that you have only machine running ?
If yes, there shouldn't be a firewall installed by default.
Start your computer up and press ctrl+alt+del to see the tasks which are currently running in your system. You should determine which is the firewall running (if there is one)by the name of the task. If you do not know the name of your firewall (e.g. SYGATE or ZoneAlarm or something) you can delete all the task of your system but SYSTRAY and EXPLORER then you should have vanquished any firewall in your system without knowing which it is
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